261115365528 has 80 divisors (see below), whose sum is σ = 774386288280. Its totient is φ = 81918542592.

The previous prime is 261115365457. The next prime is 261115365541. The reversal of 261115365528 is 825563511162.

261115365528 is a `hidden beast` number, since 2 + 6 + 1 + 11 + 53 + 65 + 528 = 666.

It is a super-2 number, since 2×261115365528² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11840626 + ... + 11862657.

Almost surely, 2^261115365528 is an apocalyptic number.

It is an amenable number.

261115365528 is an abundant number, since it is smaller than the sum of its proper divisors (513270922752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261115365528 is a wasteful number, since it uses less digits than its factorization.

261115365528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23703318 (or 23703305 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The spelling of 261115365528 in words is "two hundred sixty-one billion, one hundred fifteen million, three hundred sixty-five thousand, five hundred twenty-eight".